My most popular card (only popular card even) is the Batman slapping Robin meme on a Counterspell card
Like Goblins, this is a race of hundreds and hundreds of creature, and like Goblins, they tend toward the smaller in size, plus they have a ton of abilities in their color
The first aims for an inexorable long game, carefully timing blink spells to safely reuse ETB effects, often countering single target removal or turning evenhanded board wipes into events where you come out far ahead of the rest of the table
Highlights powerful Pokemon like Mega Darkrai ex and Mega Zeraora ex, emphasizing dark and mysterious themes
When you merge two cards with the mutate ability you chose which creature is on top
If they don't, you can propose finding one with Scheming Symmetry